Title :
Structures, spin glass and spin states in perovskite GdMnxCo1-xO3 (x ≤ 0.5)
Author :
Farhoudi, M. Mehdi ; Wang, X.L.
Author_Institution :
Spintronic & Electron. Mater. Group, Wollongong Univ., NSW, Australia
Abstract :
The structures, ferromagnetism, spin glass and spin states of Co and Mn in a polycrystalline ceramic samples of GdCo1-xMnxO3 (x = 0.2, 0.3, 0.4, 0.5) are presented. X-ray diffraction show that all the samples are single phase and crystallize as orthorhombic structures and that the lattice parameters gradually increase with x. Spin glass state and two peak features (corresponding to first order ferromagnetic and second order transition) in dc and ac susceptibility are observed. Curie-Wise fitting on the inverse susceptibility-temperature plots indicates that the valences of Co or Mn changed from 2+ or 4+ to 3+ when Co amount increases. Possible spin state transformation of Co and Mn is also suggested.
Keywords :
X-ray diffraction; ceramics; crystal structure; ferromagnetic materials; gadolinium compounds; lattice constants; magnetic susceptibility; magnetic transitions; spin glasses; valency; Curie-Wise fitting; GdCo1-xMnxO3; X-ray diffraction; ac susceptibility; dc susceptibility; ferromagnetism; first order ferromagnetic transition; inverse susceptibility-temperature plots; lattice parameters; orthorhombic structures; polycrystalline ceramics; second order transition; spin glass; spin state transformation; spin states; valences; Amorphous magnetic materials; Frequency; Glass; Magnetic field measurement; Magnetic materials; Magnetoelectronics; Paramagnetic materials; Superconducting magnets; Superconducting materials; Temperature;
Conference_Titel :
Magnetics Conference, 2005. INTERMAG Asia 2005. Digests of the IEEE International
Print_ISBN :
0-7803-9009-1
DOI :
10.1109/INTMAG.2005.1464273
